CN114088409B - Partial load performance test method for gas-steam combined cycle single-shaft unit - Google Patents
Partial load performance test method for gas-steam combined cycle single-shaft unit Download PDFInfo
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Abstract
The invention discloses a partial load performance test method of a gas-steam combined cycle single-shaft unit, which adopts a method of 'specified addition corrected combined cycle output' or 'specified gas turbine compressor inlet adjustable guide vane opening', and adopts a method of 'specified gas turbine IGV opening', and comprises the following steps: before performance test starts, setting the opening of an air inlet adjustable guide vane of a gas turbine compressor in a control system, and setting the output as a basic load output value; when the operation boundary and the operation parameters of the unit meet the thermal stability requirements in the standard, starting a performance test and collecting data; when the data to be collected meets the performance test standard requirement, stopping the test; and (3) finishing the data, calculating to obtain combined cycle output, correcting the combined cycle output to a reference working condition, calculating to obtain a combined cycle heat rate, and correcting the combined cycle heat rate to the reference working condition. The invention can enable the combined cycle single-shaft unit part load performance test to have engineering operability.
Description
Technical Field
The invention belongs to the technical field of performance tests of combined cycle single-shaft units, and particularly relates to a partial load performance test method of a gas-steam combined cycle single-shaft unit.
Background
The gas-steam combined cycle single-shaft unit is provided with a gas turbine, a steam turbine and a generator, the gas turbine and the steam turbine jointly drive the generator to generate power, the power is usually used for heating or power grid peak shaving, the operation load of the combined cycle single-shaft unit is influenced by the heat supply and power consumption requirements, most units are operated at partial load throughout the year, the performance of the partial load working condition has a larger influence on the economic index of the units, and the performance of the partial load is gradually listed as a performance guarantee value in a contract. After the combined cycle single-shaft unit is built, performance tests are carried out in the new and clean states of the equipment according to performance test standards so as to verify that the performance of the combined cycle single-shaft unit reaches the guaranteed value in the contract.
At present, each main equipment provider and a third party test unit have no engineering experience on the partial load performance test of the combined cycle single-shaft unit. The performance test of the combined cycle single-shaft unit is usually carried out based on ASME PTC46-2015 standard, and the're-drafting method' is also used in China to modify and adopt ASME PTC46 as an industry standard, namely DL/T2156-2020 'thermal generator unit overall performance test procedure' implemented by 2021, 2 months and 1 days.
The "power after correction" method is mentioned in DL/T2156-2020 for partial load performance test, the purpose of which is to determine the heat rate at the net power after correction, then when the net power of the unit is adjusted as close as possible to the design value after correction to the reference parameter condition, the combined cycle output and the heat rate under test condition are corrected to the reference condition by the correction method, the calculation process involved in the method is too complicated; the method of 'stipulating measured power test' is applicable to unit performance tests with afterburning or by using other ways of increasing the power generated, and is not explicitly applicable to combined cycle single shaft unit part load performance tests.
The output and the heat consumption rate of the combined cycle single-shaft unit are greatly influenced by external operating conditions, particularly partial load working conditions, the exhaust temperature of the gas turbine, the fuel quantity and the air inlet guide vanes of the air compressor cooperatively control the combined cycle load, when the total output of the combined cycle single-shaft unit is controlled to be a target value in performance test, the fluctuation of the output of the gas turbine influences the opening degree and the fuel flow of the air inlet guide vanes of the air compressor, and the corrected power is hardly located near the target value by adopting the method of 'specified corrected power' mentioned in DL/T2156-2020, and the standard does not clearly specify how the test is performed.
Disclosure of Invention
The invention provides a method for testing the partial load performance of a gas-steam combined cycle single-shaft unit, which comprises the steps of firstly determining the operation mode of the combined cycle single-shaft unit, determining the partial load performance test flow of the combined cycle single-shaft unit under the operation mode, providing a method for correcting the partial load working condition combined cycle heat rate, optimizing the method for regulating corrected power mentioned in the standard DL/T2156-2020, and enabling the combined cycle single-shaft unit partial load performance test to have engineering operability.
The technical scheme adopted for solving the technical problems is as follows:
a partial load performance test method of a gas-steam combined cycle single-shaft unit adopts a method of 'regulating the opening degree of a gas inlet adjustable guide vane of a gas turbine compressor' to perform performance test, and comprises the following steps:
s1, before performance test starts, setting the maximum opening of an air inlet adjustable guide vane of a gas turbine compressor as a target opening in a control system, and setting the combined cycle output as a basic load output value;
s2, the single-shaft unit operates under the condition of 'regulating the opening degree of a guide vane with adjustable air inlet of a gas turbine compressor', and the single-shaft unit is waited to enter a thermal stable state;
s3, when the operation boundary and the operation parameters of the single-shaft unit meet the thermal stability requirements in the standard, starting a performance test and collecting data;
s4, stopping the test when the data to be collected meet the performance test standard requirements;
s5, finishing the data, calculating to obtain the combined cycle output and the combined cycle heat rate, and correcting the combined cycle output and the combined cycle heat rate to the reference working condition.
Further, the method comprises the steps of,
in step S1, before performance test starts, aiming at a single-shaft unit which needs to carry out combined cycle partial load working condition performance test, collecting operation data of the single-shaft unit, and setting the maximum opening of an air inlet adjustable guide vane of a gas turbine compressor in a control system aiming at the current working condition as a target opening;
in step S2, the single-shaft unit operates under the condition of "defining the opening degree of the adjustable guide vane for the gas turbine compressor, isolates the steam-water system according to the performance test standard requirement, and waits for the single-shaft unit to enter a thermal stable state;
in step S3, data acquisition is carried out by adopting instrument measurement with accuracy meeting performance test standards, and the acquired data comprise generator end power, atmospheric temperature, atmospheric pressure, relative humidity, pressure loss of an air inlet system, natural gas temperature, natural gas flow and steam turbine exhaust back pressure.
Further, in step S5, the data are collated and calculated by adopting the formula (3) to obtain the combined cycle output, and then the combined cycle output is corrected to the reference working condition,
in the formula (3): p (P) corr For corrected combined cycle output; p (P) gross The output of the combined cycle generator is obtained, and the exciting power is subtracted; Δ2 is the additive correction of the power factor to the combined cyclic force; Δ8 is the additive correction of the steam-water leakage quantity to the combined circulating output; Δ9 is the additive correction of the turbine exhaust backpressure on the combined cycle output; alpha 1 Correcting the combined cycle output for the atmospheric temperature; alpha 2 Correction of combined cycle output for atmospheric pressure; alpha 3 Correction of combined cycle force for relative humidity; alpha 4 Correcting the combined cycle output for the natural gas temperature; alpha 5 The combination circulation output is corrected by the hydrocarbon ratio and the low-heat value of the natural gas; alpha 6 Correcting the combined circulating output for the pressure loss of the air inlet system; alpha 7 Correcting the combined circulating output for the turbine rotating speed; alpha 8 Correcting the combined circulating output for the deviation of the opening degree of the guide vane of the gas turbine compressor from the target value; k (K) P,deg Correcting the combined cycle output for the aging of the combined cycle single-shaft unit;
wherein: p (P) gross ＝P meas. -P EXC. Wherein: p (P) gross The output of the combined cycle generator is obtained, and the exciting power is subtracted; p (P) meas. Actually measuring the output for the combined cycle generator end; p (P) EXC. Is the excitation power of the generator.
Further, in step S5, the data are collated and calculated by adopting the formula (4) to obtain the combined cycle heat rate, and then the combined cycle heat rate is corrected to the reference working condition,
in the formula (4): h corr The heat rate of the combined cycle after correction is calculated; q (Q) meas,GT Inputting heat into a combustion chamber of the gas turbine; f (f) 1 The heat consumption rate of the combined cycle is corrected for the atmospheric temperature; f (f) 2 The heat consumption rate of the combined cycle is corrected for the atmospheric pressure; f (f) 3 The heat consumption rate of the combined cycle is corrected for relative humidity; f (f) 4 The method is used for correcting the heat rate of the combined cycle for the natural gas temperature; f (f) 5 The heat consumption rate of the combined cycle is corrected by the hydrocarbon ratio and the low-level heat value of the natural gas; f (f) 6 Correcting the combined cycle heat rate for the pressure loss of the air inlet system; f (f) 7 Correcting the heat consumption rate of the combined cycle for the turbine rotating speed; f (f) 8 Correcting the combined cycle heat consumption rate by deviating the opening degree of the guide vane which is adjustable in air inlet of the compressor of the gas turbine from the target value; k (K) H,deg And the heat consumption rate of the combined cycle is corrected for the aging of the combined cycle single-shaft unit.
Further, after step S5, the method further includes the steps of: and comparing the corrected combined cycle output and the combined cycle heat rate with performance guarantee values in the contract, if the performance test is finished and the guarantee value requirement is not met, carrying out steps S1-S5, and correcting the combined cycle output and the combined cycle heat rate again.
A partial load performance test method of a fuel gas-steam combined cycle single-shaft unit further adopts a method of 'specified addition corrected combined cycle output' to perform performance test, and comprises the following steps:
m1, before performance test starts, setting the combined cycle output as the combined cycle output P after addition correction in a control system set The combined cycle output target value P is based on the exciting power and the power factor of the generator refer. Correcting and obtaining the output set value P set ；
M2, the single-shaft unit operates under the condition of 'specified combined cycle output after addition correction', and waits for the single-shaft unit to enter a thermal stable state;
m3, checking whether the exciting power and the power factor are stable, and if not, outputting the combined cycle power P set Adjusting;
m4, starting a performance test and collecting data when the operation boundary and the operation parameters of the single-shaft unit meet the thermal stability requirements in the standard;
m5, stopping the test when the data to be collected meet the performance test standard requirements;
and M6, finishing the data, calculating to obtain the combined cycle heat rate, and correcting the combined cycle heat rate to the reference working condition.
Further, the method comprises the steps of,
in step M1, before performance test starts, collecting operation data of a single-shaft unit for which performance test of combined cycle part-load working condition is required, and setting combined cycle output as combined cycle output P after addition correction in a control system for current working condition set ；
In the step M4, data acquisition is carried out by adopting instrument measurement with accuracy meeting performance test standards, and the acquired data comprise generator end power, atmospheric temperature, atmospheric pressure, relative humidity, pressure loss of an air inlet system, natural gas temperature, natural gas flow and steam turbine exhaust back pressure;
after step M6, the method further comprises the steps of: and comparing the corrected combined cycle heat rate with the performance guarantee value in the contract, and if the performance test is finished and the requirements of the guarantee value are met, carrying out steps M1-M6 again to correct the combined cycle heat rate again.
Further, the method comprises the steps of,
in step M1, the combined cycle output target value P is set according to the excitation power and the power factor of the generator refer. Correcting to obtain output set value P set Specifically, by adopting the formula (1),
P set ＝P refer. +P EXC. +P P.F. (1)
in the formula (1): p (P) set For combined cycle output set point, P refer. To target output, P EXC. For exciting power of generator, P P.F. Correcting the combined cyclic output for the power factor;
in the step M2, the single-shaft unit operates under the condition of 'specified combined cycle output after addition correction', and the steam-water system is isolated according to the performance test standard requirement, and the single-shaft unit is waited to enter a thermal stable state;
in step M3, if the exciting power and the power factor are unstable, the combined cycle output set value P is again set according to the exciting power and the power factor set And (5) adjusting.
Further, in step M6, the data are collated and calculated by adopting the formula (2) to obtain the combined cycle heat rate, and then the combined cycle heat rate is corrected to the reference working condition,
in the formula (2): h corr The heat rate of the combined cycle after correction is calculated; q (Q) meas,GT Inputting heat into a combustion chamber of the gas turbine; p (P) gross The output of the combined cycle generator is obtained, and the exciting power is subtracted; Δ2 is the additive correction of the power factor to the combined cyclic force; f (f) 1 The heat consumption rate of the combined cycle is corrected for the atmospheric temperature; f (f) 2 The heat consumption rate of the combined cycle is corrected for the atmospheric pressure; f (f) 3 The heat consumption rate of the combined cycle is corrected for relative humidity; f (f) 4 The method is used for correcting the heat rate of the combined cycle for the natural gas temperature; f (f) 5 The heat consumption rate of the combined cycle is corrected by the hydrocarbon ratio and the low-level heat value of the natural gas; f (f) 6 Correcting the combined cycle heat rate for the pressure loss of the air inlet system; f (f) 7 Correcting the heat consumption rate of the combined cycle for the turbine rotating speed; f (f) 8 Correcting the combined cycle heat rate for the combined cycle output deviation target value; f (f) 9 The heat consumption rate of the combined cycle is corrected for the steam-water leakage quantity; f (f) 10 Correcting the heat consumption rate of the combined cycle for the exhaust back pressure of the steam turbine; k (K) H,deg And the heat consumption rate of the combined cycle is corrected for the aging of the combined cycle single-shaft unit.
Further, the configuration of the gas-steam combined cycle single-shaft unit does not comprise an afterburning device and an inlet air cooling device, the control system is a DCS system, and the standard is DL/T2156-2020.
The invention provides a performance test method suitable for a gas-steam combined cycle single-shaft unit, namely 'specified addition corrected combined cycle output' and 'specified gas turbine compressor air inlet adjustable guide vane opening', wherein the operation of the single-shaft unit is controlled through 'specified addition corrected combined cycle output', and only the combined cycle heat consumption rate is corrected; or controlling the operation of the single-shaft unit by 'regulating the opening degree of the air inlet adjustable guide vane of the gas turbine compressor', and correcting the combined cycle output and the combined cycle heat consumption rate.
Compared with the prior art, the invention has the beneficial effects that:
the method for regulating the combined cycle output after addition correction and regulating the opening degree of the guide vane for the gas turbine compressor inlet can enable the combined cycle single-shaft unit to have engineering operability in partial load performance test;
according to the configuration and operation characteristics of the combined cycle single-shaft unit, the operation of the unit can be controlled by adopting a mode of 'regulating the combined cycle output after addition correction' or 'regulating the opening degree of the air inlet adjustable guide vane of the gas turbine compressor', the unit has the characteristics of easy control and high safety, and under the corresponding operation mode, the combined cycle single-shaft unit partial load performance test flow and the combined cycle performance correction method are provided, when the method of 'regulating the combined cycle output after addition correction' is adopted, only the partial load combined cycle heat consumption rate is corrected, and when the method of 'regulating the air inlet adjustable guide vane opening degree of the gas turbine compressor' is adopted, the partial load combined cycle output and the combined cycle heat consumption rate are corrected simultaneously, so that the test correction method is simplified and the accuracy is improved;
the method for testing the partial load performance of the gas-steam combined cycle single-shaft unit optimizes the method for regulating the corrected power mentioned in the standard DL/T2156, so that the partial load performance test of the combined cycle single-shaft unit is more accurate and easier to operate.
Drawings
FIG. 1 is a graph showing the boundary of the partial load performance test of a combined cycle single-shaft unit in the invention;
FIG. 2 is a flow chart of a combined cycle single-shaft unit part load performance test using a prescribed additive corrected combined cycle output method;
FIG. 3 is a flow chart of a combined cycle single shaft unit part load performance test using a method for specifying adjustable vane opening for gas turbine compressor inlet.
Detailed Description
As shown in FIG. 2, the method for testing the partial load performance of the gas-steam combined cycle single-shaft unit adopts a method of 'specified addition corrected combined cycle output', and comprises the following steps:
m1, before performance test starts, collecting operation data of a single-shaft unit aiming at the single-shaft unit needing to perform combined cycle partial load working condition performance test, and setting combined cycle output in a DCS control system aiming at current working condition as combined cycle output P after addition correction set The combined cycle output target value P is based on the exciting power and the power factor of the generator refer. Correcting to obtain output set value P set Specifically, by adopting the formula (1),
P set ＝P refer. +P EXC. +P P.F. (1)
in the formula (1): p (P) set For combined cycle output set point, P refer. To target output, P EXC. For exciting power of generator, P P.F. Correcting the combined cyclic output for the power factor;
m2, operating the single-shaft unit under the condition of 'specified combined cycle output after addition correction', isolating the steam-water system according to the performance test standard requirement, and waiting for the single-shaft unit to enter a thermal stable state;
m3, checking whether the exciting power and the power factor are stable according to the specification in the standard DL/T2156-2020, and if not, resetting the combined cycle output set value P according to the exciting power and the power factor set Adjusting;
m4, when the operation boundary and operation parameters of the single-shaft unit meet the thermal stability requirements in the standard DL/T2156-2020, starting a performance test, and acquiring data by adopting instrument measurement with accuracy conforming to the performance test standard, wherein the acquired data comprise generator end power, atmospheric temperature, atmospheric pressure, relative humidity, pressure loss of an air inlet system, natural gas temperature, natural gas flow and steam turbine exhaust back pressure;
m5, stopping the test when the data to be collected meet the requirements in the performance test standard DL/T2156-2020;
m6, finishing the data, adopting the formula (2) to calculate and obtain the combined cycle heat rate, further correcting the combined cycle heat rate to the reference working condition,
in the formula (2): h corr The heat rate of the combined cycle after correction is calculated; q (Q) meas,GT Inputting heat into a combustion chamber of the gas turbine; p (P) gross The output of the combined cycle generator is obtained, and the exciting power is subtracted; Δ2 is the additive correction of the power factor to the combined cyclic force; f (f) 1 The heat consumption rate of the combined cycle is corrected for the atmospheric temperature; f (f) 2 The heat consumption rate of the combined cycle is corrected for the atmospheric pressure; f (f) 3 The heat consumption rate of the combined cycle is corrected for relative humidity; f (f) 4 The method is used for correcting the heat rate of the combined cycle for the natural gas temperature; f (f) 5 The heat consumption rate of the combined cycle is corrected for the hydrocarbon ratio C/H and the lower heating value LHV of the natural gas; f (f) 6 Correcting the combined cycle heat rate for the pressure loss of the air inlet system; f (f) 7 Correcting the heat consumption rate of the combined cycle for the turbine rotating speed; f (f) 8 Correcting the combined cycle heat rate for the combined cycle output deviation target value; f (f) 9 The heat consumption rate of the combined cycle is corrected for the steam-water leakage quantity; f (f) 10 Correcting the heat consumption rate of the combined cycle for the exhaust back pressure of the steam turbine; k (K) H,deg The heat consumption rate of the combined cycle is corrected for the aging of the combined cycle single-shaft unit;
and M7, comparing the corrected combined cycle heat rate with a performance guarantee value in the contract, if the performance test is finished, and if the performance test is not finished, carrying out steps M1-M6, and correcting the combined cycle heat rate again.
As shown in FIG. 3, a method for testing partial load performance of a gas-steam combined cycle single-shaft unit further adopts a method for specifying the opening degree of an air inlet adjustable guide vane of a gas turbine compressor for performance test, wherein the opening degree of the air inlet adjustable guide vane of the gas turbine compressor is called as the opening degree of an IGV of the gas turbine for short, and the method comprises the following steps:
s1, before performance test starts, collecting operation data of a single-shaft unit aiming at the single-shaft unit needing to perform combined cycle partial load working condition performance test, setting the maximum opening of a gas turbine IGV in a control system aiming at the current working condition as a target opening, setting combined cycle output as a basic load output value, and ensuring that the gas turbine IGV is at the target opening in the whole test process;
s2, operating the single-shaft unit under the condition of 'regulating the opening degree of the air inlet adjustable guide vane of the compressor of the gas turbine', isolating the steam-water system according to the requirement of the performance test standard, and waiting for the single-shaft unit to enter a thermal stable state;
s3, when the operation boundary and operation parameters of the single-shaft unit meet the thermal stability requirements in the standard DL/T2156-2020, starting a performance test, and acquiring data by adopting instrument measurement with accuracy conforming to the performance test standard, wherein the acquired data comprise generator end power, atmospheric temperature, atmospheric pressure, relative humidity, pressure loss of an air inlet system, natural gas temperature, natural gas flow and steam turbine exhaust back pressure;
s4, stopping the test when the data to be collected meets the requirements in the performance test standard DL/T2156-2020;
s5, finishing the data, adopting the formula (3) to calculate and obtain the combined cycle output, further correcting the combined cycle output to the reference working condition,
in the formula (3): p (P) corr For corrected combined cycle output; p (P) gross The output of the combined cycle generator is obtained, and the exciting power is subtracted; Δ2 is the additive correction of the power factor to the combined cyclic force; Δ8 is the additive correction of the steam-water leakage quantity to the combined circulating output; Δ9 is the additive correction of the turbine exhaust backpressure on the combined cycle output; alpha 1 Correcting the combined cycle output for the atmospheric temperature; alpha 2 Correction of combined cycle output for atmospheric pressure; alpha 3 Correction of combined cycle force for relative humidity; alpha 4 Correcting the combined cycle output for the natural gas temperature; alpha 5 The combined circulation output is corrected for the hydrocarbon ratio C/H and the low-heat value LHV of the natural gas; alpha 6 Correcting the combined circulating output for the pressure loss of the air inlet system; alpha 7 Correcting the combined circulating output for the turbine rotating speed; alpha 8 Correcting the combined circulating output for the deviation of the opening degree of the guide vane of the gas turbine compressor from the target value; k (K) P,deg For the correction of the combined cycle output by the aging of the combined cycle single-shaft unit,
wherein: p (P) gross ＝P meas. -P EXC. Wherein: p (P) gross The output of the combined cycle generator is obtained, and the exciting power is subtracted; p (P) meas. Actually measuring the output for the combined cycle generator end; p (P) EXC. Is the excitation power of the generator,
and the combined cycle heat rate is calculated by adopting the formula (4), so that the combined cycle heat rate is corrected to the reference working condition,
in the formula (4): h corr The heat rate of the combined cycle after correction is calculated; q (Q) meas,GT Delivering fuel to combustion chamber of gas turbineHeat is input; f (f) 1 The heat consumption rate of the combined cycle is corrected for the atmospheric temperature; f (f) 2 The heat consumption rate of the combined cycle is corrected for the atmospheric pressure; f (f) 3 The heat consumption rate of the combined cycle is corrected for relative humidity; f (f) 4 The method is used for correcting the heat rate of the combined cycle for the natural gas temperature; f (f) 5 The heat consumption rate of the combined cycle is corrected for the hydrocarbon ratio C/H and the lower heating value LHV of the natural gas; f (f) 6 Correcting the combined cycle heat rate for the pressure loss of the air inlet system; f (f) 7 Correcting the heat consumption rate of the combined cycle for the turbine rotating speed; f (f) 8 Correcting the combined cycle heat consumption rate by deviating the opening degree of the guide vane which is adjustable in air inlet of the compressor of the gas turbine from the target value; k (K) H,deg The heat consumption rate of the combined cycle is corrected for the aging of the combined cycle single-shaft unit;
s6, comparing the corrected combined cycle output and the corrected combined cycle heat rate with performance guarantee values in the contract, if the performance test is finished and the requirements are not met, carrying out steps S1-S5, and correcting the combined cycle output and the combined cycle heat rate again.
The configuration of the gas-steam combined cycle single-shaft unit does not contain devices for increasing the output of the unit, such as afterburning, air inlet cooling and the like, the correction of the combined cycle output is not considered, and only the combined cycle heat rate is corrected from a test working condition to a reference working condition. As shown in FIG. 1, the combined cycle heat rate is corrected by the turbine exhaust backpressure without considering the condenser performance.
In the invention, the gas-steam combined cycle single-shaft unit is provided with a gas turbine, a steam turbine, a generator and a waste heat boiler, the rotating parts of the gas turbine, the generator and the steam turbine are connected together to form a shaft, and the gas turbine and the steam turbine jointly push the generator to generate electricity.
The working principle of the gas-steam combined cycle single-shaft unit is as follows: the thermodynamic cycle system of the combined cycle single-shaft unit is a complex cycle system formed by combining the Brayton cycle of a gas turbine and the Rankine cycle of a steam-water system, a gas compressor of the gas turbine sucks air, the air is compressed in the gas compressor, fuel is sprayed into a combustion chamber, the compressed air and the fuel are mixed and combusted to generate high-temperature and high-pressure gas, the high-temperature and high-pressure air enters a turbine and pushes the turbine to do work, meanwhile, the turbine discharges exhaust gas, the exhaust gas discharged by the turbine enters a waste heat boiler and serves as a heat source to heat water into high-temperature and high-pressure steam, the steam enters a steam turbine to push blades to do work, and the gas turbine and the steam turbine jointly input mechanical work to push a generator to rotate and generate power.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.
Claims (7)
1. A partial load performance test method of a gas-steam combined cycle single-shaft unit is characterized by comprising the following steps of: performance test is carried out by adopting a method of 'regulating the opening degree of an air inlet adjustable guide vane of a gas turbine compressor', and the method comprises the following steps:
s1, before performance test starts, setting the maximum opening of an air inlet adjustable guide vane of a gas turbine compressor as a target opening in a control system, and setting the combined cycle output as a basic load output value;
s2, the single-shaft unit operates under the condition of 'regulating the opening degree of a guide vane with adjustable air inlet of a gas turbine compressor', and the single-shaft unit is waited to enter a thermal stable state;
s3, when the operation boundary and the operation parameters of the single-shaft unit meet the thermal stability requirements in the standard, starting a performance test and collecting data;
s4, stopping the test when the data to be collected meet the performance test standard requirements;
s5, finishing the data, calculating to obtain combined cycle output and combined cycle heat rate, and correcting the combined cycle output and the combined cycle heat rate to the reference working condition;
in step S5, the data are collated and calculated by adopting a formula (3) to obtain the combined cycle output, and then the combined cycle output is corrected to the reference working condition,
in the formula (3): p (P) corr For corrected combined cycle output; p (P) gross The output of the combined cycle generator is obtained, and the exciting power is subtracted; Δ2 is the additive correction of the power factor to the combined cyclic force; Δ8 is the additive correction of the steam-water leakage quantity to the combined circulating output; Δ9 is the additive correction of the turbine exhaust backpressure on the combined cycle output; alpha 1 Correcting the combined cycle output for the atmospheric temperature; alpha 2 Correction of combined cycle output for atmospheric pressure; alpha 3 Correction of combined cycle force for relative humidity; alpha 4 Correcting the combined cycle output for the natural gas temperature; alpha 5 The combination circulation output is corrected by the hydrocarbon ratio and the low-heat value of the natural gas; alpha 6 Correcting the combined circulating output for the pressure loss of the air inlet system; alpha 7 Correcting the combined circulating output for the turbine rotating speed; alpha 8 Correcting the combined circulating output for the deviation of the opening degree of the guide vane of the gas turbine compressor from the target value; k (K) P,deg Correcting the combined cycle output for the aging of the combined cycle single-shaft unit;
wherein: p (P) gross ＝P meas. -P EXC. Wherein: p (P) gross The output of the combined cycle generator is obtained, and the exciting power is subtracted; p (P) meas. Actually measuring the output for the combined cycle generator end; p (P) EXC. The excitation power of the generator;
in step S5, the data are collated and the combined cycle heat rate is calculated by adopting a formula (4), so that the combined cycle heat rate is corrected to the reference working condition,
in the formula (4): h corr The heat rate of the combined cycle after correction is calculated; q (Q) meas,GT Inputting heat into a combustion chamber of the gas turbine; f (f) 1 The heat consumption rate of the combined cycle is corrected for the atmospheric temperature; f (f) 2 Is atmospheric pressure pairCorrecting the heat rate of the combined cycle; f (f) 3 The heat consumption rate of the combined cycle is corrected for relative humidity; f (f) 4 The method is used for correcting the heat rate of the combined cycle for the natural gas temperature; f (f) 5 The heat consumption rate of the combined cycle is corrected by the hydrocarbon ratio and the low-level heat value of the natural gas; f (f) 6 Correcting the combined cycle heat rate for the pressure loss of the air inlet system; f (f) 7 Correcting the heat consumption rate of the combined cycle for the turbine rotating speed; f (f) 8 Correcting the combined cycle heat consumption rate by deviating the opening degree of the guide vane which is adjustable in air inlet of the compressor of the gas turbine from the target value; k (K) H,deg And the heat consumption rate of the combined cycle is corrected for the aging of the combined cycle single-shaft unit.
2. The method for testing the part load performance of the gas-steam combined cycle single-shaft unit according to claim 1, wherein the method comprises the following steps of:
in step S1, before performance test starts, aiming at a single-shaft unit which needs to carry out combined cycle partial load working condition performance test, collecting operation data of the single-shaft unit, and setting the maximum opening of an air inlet adjustable guide vane of a gas turbine compressor in a control system aiming at the current working condition as a target opening;
in step S2, the single-shaft unit operates under the condition of "defining the opening degree of the adjustable guide vane for the gas turbine compressor, isolates the steam-water system according to the performance test standard requirement, and waits for the single-shaft unit to enter a thermal stable state;
in step S3, data acquisition is carried out by adopting instrument measurement with accuracy meeting performance test standards, and the acquired data comprise generator end power, atmospheric temperature, atmospheric pressure, relative humidity, pressure loss of an air inlet system, natural gas temperature, natural gas flow and steam turbine exhaust back pressure.
3. The method for testing the part load performance of the gas-steam combined cycle single-shaft unit according to claim 2, wherein the method comprises the following steps of: after step S5, the method further comprises the steps of: and comparing the corrected combined cycle output and the combined cycle heat rate with performance guarantee values in the contract, if the performance test is finished and the guarantee value requirement is not met, carrying out steps S1-S5, and correcting the combined cycle output and the combined cycle heat rate again.
4. A partial load performance test method of a gas-steam combined cycle single-shaft unit is characterized by comprising the following steps of: the performance test is also carried out by adopting a method of 'specified addition corrected combined cycle output', comprising the following steps:
m1, before performance test starts, setting the combined cycle output as the combined cycle output P after addition correction in a control system set The combined cycle output target value P is based on the exciting power and the power factor of the generator refer. Correcting and obtaining the output set value P set ；
In step M1, the combined cycle output target value P is set according to the excitation power and the power factor of the generator refer. Correcting to obtain output set value P set Specifically, by adopting the formula (1),
P set ＝P refer. +P EXC. +P P.F. (1)
in the formula (1): p (P) set For combined cycle output set point, P refer. To target output, P EXC. For exciting power of generator, P P.F. Correcting the combined cyclic output for the power factor;
m2, the single-shaft unit operates under the condition of 'specified combined cycle output after addition correction', and waits for the single-shaft unit to enter a thermal stable state;
m3, checking whether the exciting power and the power factor are stable, and if not, outputting the combined cycle power P set Adjusting the set value;
m4, starting a performance test and collecting data when the operation boundary and the operation parameters of the single-shaft unit meet the thermal stability requirements in the standard;
m5, stopping the test when the data to be collected meet the performance test standard requirements;
m6, finishing the data, calculating to obtain a combined cycle heat rate, and correcting the combined cycle heat rate to a reference working condition;
in the step M6, the data are arranged and the combined cycle heat rate is calculated by adopting the formula (2), so that the combined cycle heat rate is corrected to the reference working condition,
in the formula (2): h corr The heat rate of the combined cycle after correction is calculated; q (Q) meas,GT Inputting heat into a combustion chamber of the gas turbine; p (P) gross The output of the combined cycle generator is obtained, and the exciting power is subtracted; Δ2 is the additive correction of the power factor to the combined cyclic force; f (f) 1 The heat consumption rate of the combined cycle is corrected for the atmospheric temperature; f (f) 2 The heat consumption rate of the combined cycle is corrected for the atmospheric pressure; f (f) 3 The heat consumption rate of the combined cycle is corrected for relative humidity; f (f) 4 The method is used for correcting the heat rate of the combined cycle for the natural gas temperature; f (f) 5 The heat consumption rate of the combined cycle is corrected by the hydrocarbon ratio and the low-level heat value of the natural gas; f (f) 6 Correcting the combined cycle heat rate for the pressure loss of the air inlet system; f (f) 7 Correcting the heat consumption rate of the combined cycle for the turbine rotating speed; f (f) 8 Correcting the combined cycle heat rate for the combined cycle output deviation target value; f (f) 9 The heat consumption rate of the combined cycle is corrected for the steam-water leakage quantity; f (f) 10 Correcting the heat consumption rate of the combined cycle for the exhaust back pressure of the steam turbine; k (K) H,deg And the heat consumption rate of the combined cycle is corrected for the aging of the combined cycle single-shaft unit.
5. The method for testing the part load performance of the gas-steam combined cycle single-shaft unit according to claim 4, which is characterized by comprising the following steps of:
in step M1, before performance test starts, collecting operation data of a single-shaft unit for which performance test of combined cycle part-load working condition is required, and setting combined cycle output as combined cycle output P after addition correction in a control system for current working condition set ；
In the step M4, data acquisition is carried out by adopting instrument measurement with accuracy meeting performance test standards, and the acquired data comprise generator end power, atmospheric temperature, atmospheric pressure, relative humidity, pressure loss of an air inlet system, natural gas temperature, natural gas flow and steam turbine exhaust back pressure;
after step M6, the method further comprises the steps of: and comparing the corrected combined cycle heat rate with the performance guarantee value in the contract, and if the performance test is finished and the requirements of the guarantee value are met, carrying out steps M1-M6 again to correct the combined cycle heat rate again.
6. The method for testing the part load performance of the gas-steam combined cycle single-shaft unit according to claim 5, wherein the method comprises the following steps of:
in the step M2, the single-shaft unit operates under the condition of 'specified combined cycle output after addition correction', and the steam-water system is isolated according to the performance test standard requirement, and the single-shaft unit is waited to enter a thermal stable state;
in step M3, if the exciting power and the power factor are unstable, the combined cycle output set value P is again set according to the exciting power and the power factor set And (5) adjusting.
7. The method for testing the partial load performance of the gas-steam combined cycle single-shaft unit according to claim 1 or 4, wherein the method comprises the following steps of: the configuration of the gas-steam combined cycle single-shaft unit does not comprise an afterburning device and an air inlet cooling device, the control system is a DCS system, and the standard is DL/T2156-2020.
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